- Astronomy Picture of the Day: The Sun
Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
http://antwrp.gsfc.nasa.gov/apod/sun.html
(Added: Mon Oct 28 2002)
- Big Bear Solar Observatory
The Big Bear Solar Observatory (BBSO) located in Big Bear Lake, Ca. offers daily images of the sun, a tour of the observatory, and various movies (MPEG), images, and links related to solar astronomy.
http://www.bbso.njit.edu/
(Added: Sat Oct 26 2002)
- Chromosphere
The chromosphere is an irregular layer above the photosphere where the temperature rises from 6000° C to about 20,000° C. Learn more about this layer of the Sun at this site.
http://science.msfc.nasa.gov/ssl/pad/solar/chromos.htm
(Added: Mon Oct 28 2002)
- Chromosphere of the Sun
The gases of the Sun extend far beyond the photosphere, which may be considered the lowest level of the solar atmosphere. The region immediately above the photosphere is called the chromosphere.
http://csep10.phys.utk.edu/astr162/lect/sun/chromosphere.html
(Added: Mon Oct 28 2002)
- Chromospheric Features
Learn about spicules, prominences, filaments and plage.
http://science.msfc.nasa.gov/ssl/pad/solar/feature2.htm
(Added: Sat Oct 26 2002)
- Granulation of the Photosphere
The photosphere under close observation exhibits a mottled appearance that is called granulation. This is a consequence of heat convection below the photosphere.
http://csep10.phys.utk.edu/astr162/lect/sun/granulation.html
(Added: Sat Oct 26 2002)
- Helioseismology
Over the last 15 years or so a new approach has emerged that provides a means of making direct measurements of the internal structure and dynamics of the Sun and, ultimately, other stars as well. The discovery of propagating sound waves in the Sun in the 1960's and their explanation in the 1970's has led to the development of this exciting new technique called helioseismology.
http://helios.tuc.noao.edu/helioseismology.html
(Added: Sat Oct 26 2002)
- How the Sun Works
Howstuffworks examines the fascinating world of our nearest star. They look at the parts of the sun, the amazing way it makes light and heat, and its major features.
http://www.howstuffworks.com/sun.htm
(Added: Sun Oct 27 2002)
- Magnetic Field of the Sun
The Sun has a strong and complex magnetic field, and much solar activity appears to be directly connected with the properties of the magnetic field.
http://csep10.phys.utk.edu/astr162/lect/sun/magnetic.html
(Added: Mon Oct 28 2002)
- National Solar Observatory
Find out how to submit a proposal, view images from telescopes, or read FAQ. Located at Sacramento Peak, in Sunspot, New Mexico.
http://www.sunspot.noao.edu/
(Added: Sat Oct 26 2002)
- Photosphere
The Sun is a ball of gas, so it does not have a well-defined surface. When we speak of the surface of the Sun, we normally mean the photosphere.
http://csep10.phys.utk.edu/astr162/lect/sun/photosphere.html
(Added: Sat Oct 26 2002)
- Photospheric Features
Learn about sunspots, faculae and granules. View images of each.
http://science.msfc.nasa.gov/ssl/pad/solar/feature1.htm
(Added: Sat Oct 26 2002)
- Prominences and Plages
Prominences and plages are structures that occur above the photosphere of the Sun. Plages are bright cloud-like features found around sunspots that represent regions of higher temperature and density within the chromosphere. Prominences are features that may reach high into the corona, often as graceful loops that may hang suspended for many days.
http://csep10.phys.utk.edu/astr162/lect/sun/prominences.html
(Added: Mon Oct 28 2002)
- Proton-Proton Chain
This web site describes the proton-proton chain reaction that takes place in the core of the sun.
http://csep10.phys.utk.edu/astr162/lect/energy/ppchain.html
(Added: Sat Oct 26 2002)
- Solar and Heliospheric Observatory (SOHO)
Ambitious project by NASA and ESA will give solar physicists their first long term, uninterrupted view of the Sun. Find images, data and news.
http://sohowww.nascom.nasa.gov/
(Added: Sat Oct 26 2002)
- Solar Corona
The extended outer atmosphere of the Sun is called the corona. It has a temperature of millions of degrees, but it is 10 billion times less dense than the atmosphere of the Earth at sea level.
http://csep10.phys.utk.edu/astr162/lect/sun/corona.html
(Added: Mon Oct 28 2002)
- Solar Corona
The Corona is the Sun's outer atmosphere. It is visible during total eclipses of the Sun as a pearly white crown surrounding the Sun. Read more about it and view images at this site.
http://science.msfc.nasa.gov/ssl/pad/solar/corona.htm
(Added: Sat Oct 26 2002)
- Solar Flares
The Sun Celebrates Bastille Day!
The most violent events on the surface of the Sun are sudden eruptions called solar flares. Flares typically last a few minutes and can release energies equivalent to millions of hydrogen bombs.
http://csep10.phys.utk.edu/astr162/lect/sun/flares.html
(Added: Mon Oct 28 2002)
- Solar Neutrino Problem
For more than twenty years, the Homestake Solar Neutrino Experiment in the Homestake Gold Mine in South Dakota has been attempting to measure neutrino fluxes from space; in particular, this experiment has been gathering information on solar neutrino fluxes. The results of this experiment have been checked against predictions made by standard solar models and it has been discovered that only one-third of the expected solar neutrino flux has been detected. This "Where are the missing neutrinos?" question is known as the Solar Neutrino Problem.
http://www.maths.qmw.ac.uk/~lms/research/neutrino.html
(Added: Sat Oct 26 2002)
- Solar Wind
The Sun makes itself known throughout much of the Solar System by the influence the solar wind of high-speed charged particles constantly blowing off the Sun. The solar wind may be viewed as an extension of the outer atmosphere of the Sun (the corona) into interplanetary space.
http://csep10.phys.utk.edu/astr162/lect/sun/wind.html
(Added: Mon Oct 28 2002)
- Solar Wind
The solar wind streams off of the Sun in all directions at speeds of about 400 km/s (about 1 million miles per hour). The source of the solar wind is the Sun's hot corona.
http://csep10.phys.utk.edu/astr162/lect/sun/corona.html
(Added: Sat Oct 26 2002)
- Stanford Solar Center
This site presents a collection of fun educational activities based on Solar Oscillations Investigation (SOI) and Solar and Heliospheric Observatory (SOHO) data. Students can explore the Sun's tangled magnetic field, its turbulent surface motions, the dramatic sunspot cycle, and even what magic happens in the solar interior where instrumental eyes cannot penetrate.
http://solar-center.stanford.edu/
(Added: Sun Oct 06 2002)
- Sunspot Cycle
Sunspots have been monitored since the time of Galileo. One striking feature that emerges from the long-term data is that the number of sunspots observed in a given year varies in a dramatic and highly predictable way.
http://csep10.phys.utk.edu/astr162/lect/sun/sscycle.html
(Added: Sat Oct 26 2002)
- Sunspot Cycle
In 1610, shortly after viewing the sun with his new telescope, Galileo Galilei made the first European observations of Sunspots. Daily observations were started at the Zurich Observatory in 1749 and with the addition of other observatories continuous observations were obtained starting in 1849.
http://science.msfc.nasa.gov/ssl/pad/solar/sunspots.htm
(Added: Mon Oct 28 2002)
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